I'm just making this up but --
I think the chicken came first, since it probably evolved from some form of dinosaur or something. And just continued evolving until it became the way it looks today. And THEN had its eggs.

The question “which came first, the chicken or the egg?” looks at first glance like a matter of straightforward reproductive biology. But before we can even begin to answer this question, we must define our terms. So actually, it is a classic case of semantic ambiguity…a problem of meaning and interpretation.

1. Which came first, the chicken or (just any old) egg?
2a. Which came first, the chicken or an egg laid by a chicken?
2b. Which came first, the chicken or an egg containing a chicken?
2c. Which came first: the chicken, or an egg laid by and containing a chicken?

Contrary to popular belief, there is indeed a definite answer to each of these questions. Specifically, the answers are: (1) The egg. (2a) The chicken. (2b) The egg. (2c) The chicken. Given some knowledge of logic and biology, these answers are not hard to verify.

For the complete idiots that think the egg came first: The egg needs to be in warmth or be placed in an incubator-like setting. If it isn't, well, it won't hatch. Now tell me, how would the egg hatch without the hen sitting on it?